Exchange Relaying Abuse

[BillBruce]

I've gone through the necessary steps to prevent unwanted relaying through my Exchange Server (5.5/SP4). I've also telnet-ed to relay-test.mail-abuse.org to test the integrity of my system. It ran 17 tests and gave me a final message of: &quot;System appeared to accept 1 relay attempts.&quot; It looks as though the recipient, <mail-abuse.org!nobody> went through OK--thus failing.

Can anybody shed some light on this? Anyway to shut it down further? All other 16 tests either showed either &quot;553 malformed address&quot; or &quot;550 Relaying is prohibited.&quot;

Thanks--BillBruce